Cryogenic cooler apparatus

Details Cryogenic cooler apparatus Cryogenic cooler apparatus

1980-12-22

1983-01-04

Capossela, Ronald C.

Refrigeration

Gas compression, heat regeneration and expansion, e.g.,...

62514R, F25B 900

Patent

active

043666760

ABSTRACT:
A Malone-type final stage for utilization in a Stirling cycle cryogenic cooler apparatus includes a displacer slidable within a vessel. .sup.4 He, .sup.3 He, or a mixture thereof is made to flow in a pulsating unidirectional manner through a regenerator in the displacer by utilization of check valves in separate fluid channels. Stacked copper screen members extend through the channels and through a second static thermodynamic medium within the displacer to provide efficient lateral heat exchange and enable cooling to temperatures in the range of 3-4 K. Another embodiment utilizes sintered copper particles in the regenerator. Also described is a final stage that has a non-thermally conducting displacer having passages with check valves for directing fluid past a regenerator formed in the surrounding vessel.

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"Principles of Liquids Working in Heat Engines", by P. C. Allen et al., Proceedings of the National Academy of Sciences USA, vol. 77, No. 1, pp. 39-43, Jan. 1980.
"The Stirling Refrigeration Cycle", by J. W. L. Kohler, published in Scientific American.
"Timed Surge Chamber Creates Self-Acting Cryogenic Cooler" by F. D. Yeaple, published in the Oct. 12, 1970 addition of Product Engineering Magazine.
"Miniature Single-Stage Cryogenerator Reaches 30 Deg K" by Bernard Kovit, published in the Jan. 1961 issue of Space/Aeronautics Magazine.
"Applications of Closed-Cycle Cryocoolers to Small Superconducting Devices", edited by Zimmerman and Flynn, issued by the U.S. Department of Commerce, Apr. 1978, pp. 59-65.
"New Prime Mover" by J. F. J. Malone, published in the Journal of the Roay Society of Arts, Jun. 12, 1931, pp. 180-709.

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